Overview

Magnesium chloride (mag-NEE-zee-um KLOR-ide) is a white crystalline solid that is strongly deliquescent. It absorbs moisture from the air to become the hydrated form, magnesium chloride hexahydrate (MgCl₂·6H₂O). A deliquescent substance is one that takes on moisture from the air, often to the extent of dissolving in its own water of hydration. Magnesium chloride is an important industrial chemical, used in the production of magnesium, textile and paper manufacture, and cements; in refrigeration and fireproofing; and as a deicing agent.

Key Facts

Other Names:

Magnesium dichloride

Formula:

MgCl₂

Elements:

Magnesium, chlorine

Compound Type:

Inorganic salt; binary salt

State:

Solid

Molecular Weight:

95.21 g/mol

Melting Point:

714°C (1,320°F)

Boiling Point:

1,412°C (2,574°F)

Solubility:

Soluble in water; moderately soluble in ethyl alcohol

How It Is Made

Magnesium chloride is extracted from seawater or brine, of which it is a component, and from minerals, such as...